Custom Home Builder Contract: What It Should Include
A custom home builder contract should spell out who the parties are, exactly what’s being built, what it costs and how the price can change, when and how the builder gets paid, how long it should take, and what happens when something goes wrong. At a minimum that means the plans and specifications attached as exhibits, a price structure, a payment schedule, a change order process, allowances, insurance, warranty, and a dispute resolution clause. If a topic could cause an argument, it belongs in the contract.
I’m a builder, not a lawyer, and nothing here is legal advice. But I’ve learned that the contract is the cheapest insurance you’ll ever buy, and most builders are underinsured.
What should a custom home builder contract include?
Here are the sections I’d expect to see in any custom home building contract:
Parties and property. Legal names of the owners and the building entity, plus the property’s legal description.
Contract documents. A list of everything that makes up the deal: the agreement, the plans by date, the specifications by date, the budget or schedule of values, and any addenda. State which one governs if they conflict.
Scope of work and exclusions. What you’re building and, just as important, what you’re not.
Price and price structure. Fixed price or cost-plus, and how the builder’s fee is calculated.
Allowances. Each one listed with its amount and what it covers, plus how overages and credits are handled.
Payment terms. Deposit, draw schedule, days to pay, and what happens when payment is late.
Change orders. Written, signed, priced, and paid before the work happens.
Schedule. Estimated start and completion, and what counts as an excusable delay.
Owner responsibilities. Financing, timely selections, site access, and owner-supplied items.
Insurance and risk of loss. Who carries builder’s risk, liability, and what happens if the house is damaged mid-build.
Warranty. What’s covered, for how long, and how claims are made.
Default, termination, and dispute resolution. The off-ramps, and the rules for using them.
How should the contract define scope and specifications?
By reference to specific, dated documents. “Per plans and specs” is only useful if everyone agrees which plans and which specs. Attach them, date them, and have the client initial them.
This is where most contracts are weakest. A forty-page legal agreement stapled to a two-page spec sheet is a strong fence around an empty lot. The specifications are what the client is actually buying, so write them properly. I walked through the method in how to write construction specifications, and our Budget and Specifications Template gives you the exhibits in a format that’s ready to attach.
How should a custom home construction contract handle price?
It should name the pricing model clearly and then define every moving part of it. The two common structures:
Fixed price. One number for the defined scope. The builder carries the risk of cost overruns on that scope, and the client pays for changes and allowance overages.
Cost-plus. The client pays actual costs plus the builder’s fee, either a percentage or a fixed amount. The contract should define what counts as a cost, how overhead and supervision are billed, and what records the client can see.
Neither one is right for every job. I compared them in cost-plus vs. fixed price. Whichever you pick, a few items need their own language:
Allowances. State whether each covers material only or material and labor, and whether your markup applies to overages.
Price escalation. If material prices jump between signing and purchase, who pays? Many builders add an escalation clause. Have your attorney draft it.
Unforeseen conditions. Rock, bad soil, buried surprises. Say how they’re handled before the excavator finds them.
What payment terms belong in a custom home building contract?
The contract should state the deposit, the draw schedule, how each draw is requested and verified, how many days the client has to pay, and your rights if they don’t. That last one usually includes interest on late payments and the right to stop work.
If a lender is involved, your payment terms have to line up with the lender’s draw process, or you’ll be owed money that nobody is allowed to release. I covered the mechanics in how a construction draw schedule works. Rules about deposits and how construction funds must be handled differ by state, so confirm yours with your attorney.
How should the contract handle changes and delays?
Changes should require a written change order signed by both parties, showing the price and the schedule impact, with payment due at signing. The contract should also state your markup on changes and any administrative fee, so the first change order isn’t also the first time the client hears about it. There’s a full breakdown in what a change order clause should say.
For delays, I’d want the contract to cover:
Excusable delays. Weather, late client selections, owner-requested changes, permitting and inspection delays, material shortages, and other things outside the builder’s control.
Completion language. An estimated completion date, with a definition of substantial completion.
Selection deadlines. If the client’s late decision delays the job, the schedule extends.
What protections should the builder insist on?
A defined warranty. A written limited warranty with clear terms beats an undefined expectation that you’ll fix everything forever. State law affects what you can and can’t limit.
A dispute resolution process. Many contracts require a notice and an opportunity to fix the problem first, then mediation, then arbitration or court.
Site access rules. When the owner can visit, and a ban on directing your trades.
Right to stop work. For non-payment, after written notice.
Termination terms. What each side owes if the relationship ends early.
Required state notices. Many states mandate specific disclosures or language in residential construction contracts. Your attorney will know which apply to you.
Can you use a sample custom home building contract?
You can use one as a starting point for understanding the structure, and that’s about all I’d trust it for. A sample custom home building contract pulled from the internet was written for someone else’s state, someone else’s business model, and possibly someone else’s decade. Industry associations publish form agreements that many builders start from, and those are better than a random download.
Either way, pay a construction attorney in your state to review and adapt it once. Then use that same contract on every job, and update it when you learn something the hard way. The review costs a fraction of what one bad clause can.
Frequently asked questions
Is a custom home builder contract the same as a purchase agreement?
Usually not. A purchase agreement typically covers buying a finished or spec home, while a custom home construction contract covers building a home on the owner’s lot to agreed plans and specifications.
Should a custom home building contract be fixed price or cost-plus?
Either can work. Fixed price gives the client certainty and puts more risk on the builder, while cost-plus is more transparent and shifts cost risk to the client.
Who should write the custom home builder contract?
The builder should provide it, drafted or reviewed by a construction attorney licensed in the builder’s state. The client should have their own attorney review it too.
What is the most important part of a custom home construction contract?
In my experience, the attached specifications and the change order clause. Most disputes are about what was included and what changed.
BTW, if your contract needs stronger exhibits behind it, grab our Budget and Specifications Template over at the Building Optimal Shop, where you can check out the rest of our swag to build a better business. Proceeds go to benefit, Exponencialistas, my non-profit investing in entrepreneurs transforming their communities in Latin America.